Support for jack hammers



Jan, 6,1925.

J. KLARA .SUPPORT 'FOR JACK HAMMERS Filed l Aug. 23, 1921 Patented Jan. 6, 1925.

UNI-TED STAT Ets JOHN KLAR-1A, 0F OLYPHANT. PENNSYLVANIA.

SUPPORT FOR JACK -HAMIVLERS Application filed August l23, 1921.

To all' whom t mag/concern:

Beit known that 1,' J'oHN' KLARA, of @lyphant, in the county'A of Laclrawanna, inthe State of Pennsylvania, have invented new and useful Improvements in a Support for J ack Hammers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description;

This invention relates to a support for jack hammers andanalogous implements commonly'used in quarries and minor operations in which it is necessary tosupport the implement at varying heights and at widely different angles of approach to the work.

The main object is to provide a unitary support of this character having simple and eilicient means for easily and quickly adjusting the implement to various heights and angles while the drill or hammer is in operation.

Other objects and'K usesV relating to specific parts of the device will' be brought out in the following description:

In the drawings:

Figure l is a side elevation of a supporting device embodying the various features of my invention and a jack hammer or drill operably mounted thereon.

Figures 2 andl 3 are enlarged vertical'sec.- tional views taken, respectively, on lines 2 2 and 3 3, Figure l.

Figures 4 and' 5'. are enlarged detail vertical sectional views taken, respectively, on lines 4 4 and 5 5, Figure 1.

As illustrated, this device comprises an upright standard 1 composed of lower and upper sections Q and 8 telescoping with each other and, therefore, extensible vertically or longitudinally, the section 2f-.being provided withl a forked lower end 4; for engaging with the ground, while the section 3 is preferably tubular for receiving the shank of the section 2 which latter isprovided with a series of apertures -5 in spaced relation one above the other for receiving a locking bolt or pin 6 said pin being inserted in a. transverse aperture in the lower end of the section 3- so that it may be removed if necesary for the adjustment of the section 3 along the section Q and retention of those sections in their adjusted posi tions.

The upper end of the section 3 is threaded internally for receiving the lower Serial'y No. 49.4;625.

reduced threaded end of an additional top 4 section 7 whereby the sections 3fand 7- may be secured to each otherV with; a limited relative lengthwise adjustment in addition to` the adjustability of the sections- 2 andv 3 The upper end of the section 7 isprovided with a substantially flat lug- 8' y to. which is pivoted at 9 the forked end of a vertically 'adjustable arm 10 which is movable about the axisof the pivot Q to different angles relatively to or in v'ertical alinement withl the standard 1 and isA held in its adjusted .position by a locking pin or bolt 11 passing: through an aperture in the forked end of the arm l0 and. also through any one of a series of apertures l2- in the lug 8 the; vlast named aperture being arranged in.-y a `row concentric withl the pivot 9 The outer end of the arm 10 farthest from the standard 1 is provided with a journal opening' l3 for reeeiving'thehub l3 of a gear M which is provi-ded with a central lengthwise threadede opening l5 for receivinga screw 16- whereby r the turni-ng'of the gear M inthe journal bearing l3 in onefdirect-ion or the other will' cause a correspond-ingV elevation ordepressionof the screw 1G- The means for turning this gear which in reality consists of a nut. or pinion 17 journaled by a stud2 18 on the adjacent ve1id"oi:tlie arm 10- and: meshin-O' with the gear M and also provided with a handcrank 19- by which it may herotated to effect the rotation of the gear-nut, 14:

A head1 2O is rigidlyl secured by: a bolt or rivet 21- tov the upper end of the screw I6- and is provided' with asubstantiall'y flat lug- 2%. A jointed arm 23- i com-posed of sections Q4- and 25 v is 26 for permitting relative vertical adjustment of said sections7 one of which, as

the section -25'-, is provided with a plurality of apertures -80- for receiving a locking bolt -31- by which the sections 24- and -25- may be held in fixed relation or the section 25- held at different angles relatively to the section -2t.

The hub of the gear -ltwhich is j ournaled in the arm -10- is reduced in diameter to form a shoulder which rests upon the upper face of said arm to support the gearvagainst downward displacement, while the upward displacement is prevented by means of a section -lO- of the arm l0- engaging the upper face of the gear l-L.

A clamp S2-- is provided with a cylindrical shank which is inserted in a vertical opening 234- in the outer end of the arm section #25# for vertical adjustment therein and is provided with a series of bolt openings 35M in spaced relation one above the other for receiving a locking pin S6-,the latter being also passed through an aperature in the outer end of the section 25 as shown in Figure 5.

The clamp -32- is secured to the jack hammer between the handle and tool and is provided with a fixed jaw -37- and a movable jaw -38--, the latter being pivoted at its lower en-d at 39- to the base of the fixed jaw w37- to move toward and from said fixed jaw and has its upper end provided with a hook-shaped extremity adapted to be engaged by a link -flO- which is pivoted to the fixed jaw -37n to hold the movable jaw in its closed position, said link being held in its closed position by means of a catch -llpivoted at A2- to the fixed jaw to swing to and from a position over the top of the link -4t0-. The clamp serves as a means for sulpporting a jack hammer or analogous imp ement -A- which may be operated by any suitable power as for example, compressed air directed thereto through a. flexible pipe -a-, lFigure l.

/Vhen the device is adjusted for holding the implement --A- to the desired height and angle, said implement may be directed into the work -B- by means of a handle f-athereon, the entire device being comparatively light and easily portable from place topplace. lf the device is adjusted for supporting the implement in a certain plane and the implement is to be used at diiierent angles under such adjustment, it may be readily adjusted rotarily about the axis of the gear-hub -15- or screw 16- without any further adjustment.

The vertical adjustment may be effected by moving the member -3- along the member -2 or by the rotation of the gear nut i4- through the medium of the hand-crank -l9 and gear #17% or suoli adjustment may be eli'ected by rocking eitherA of the arms -lO- or -23- about their respective pivots Q- or 2-, while the vertical angular adjustment may also be effected by the movement of said arms about their respective pivots, or an ad* ditional vertical angular adjustmentI may be produced by rocking the section 25 of the arm --23- upon its pivot 29, each of said adjustments being highly useful in properly directing the tool to the work,

Wlhat l claim is:

l. The Vcombination with a jack-hammer having a tool in one end and a handle o-n the other end, ot a support including a standard having its lower end provided with ground-engaging points at opposite sides ot 'its axis to permit rocking movement of the standard at said points, the upper end of the standard being provided with a laterally projecting arm having a journal bearing in its outer end, a gear-nut journaled in said bearing, means for holding the nut against axial movement, a screw engaged by the nut, means mounted on the screw for supporting the jack-hammer and means operable at will for rotating the uut to adjust the screw axially to enable the ack-hammer to be held in substantially the saine plane as the standard is rocked about its bearing points in forcing the tool into the work.

2. A jack-hammer support as in claim l in which the laterally projecting arm is pivoted tov the standard to swing to differentangles relatively thereto to vary the angle` of lapproach of the jack-hammer to the work.

ln witness whereof I have hereunto set my hand this 13th day of August 1921.

JOHN KLARA.

lVitnesses:v Y

GEORGE H. ZATOR,

J. W. HOGAN. 

